U.S. patent application number 15/773165 was filed with the patent office on 2018-11-22 for double-sided cutting insert having high feed rate and cutting tool equipped therewith.
This patent application is currently assigned to KORLOY INC.. The applicant listed for this patent is KORLOY INC.. Invention is credited to Sun Yong AHN, Young Nam CHOI, Sang Yong LEE, Jae Yeong MUN.
Application Number | 20180333791 15/773165 |
Document ID | / |
Family ID | 58662123 |
Filed Date | 2018-11-22 |
United States Patent
Application |
20180333791 |
Kind Code |
A1 |
LEE; Sang Yong ; et
al. |
November 22, 2018 |
DOUBLE-SIDED CUTTING INSERT HAVING HIGH FEED RATE AND CUTTING TOOL
EQUIPPED THEREWITH
Abstract
The technical objective of the present invention is to provide a
double-sided cutting insert having a high feed rate, which can
increase the edge strength and reduce the cutting load, and thus
can be suitable for high feed rate processing. To this end, a
double-sided cutting insert having a high feed rate according to
the present invention comprises: two main surfaces that face in
opposite directions; two shorter side surfaces, which connect
between the two main surfaces, and which face in opposite
directions; two longer side surfaces, which connect between the two
main surfaces and between the two shorter side surfaces, which face
in opposite directions, and the width of which is larger than that
of the shorter side surfaces; and a fastening hole that extends
through the two longer side surfaces such that a cutting tool
fastening bolt is inserted therein, wherein the double-sided
cutting insert having a high feed rate comprises a shorter cutting
edge provided on a boundary portion between each of the main
surfaces and each of the shorter side surfaces, a longer cutting
edge provided on a boundary portion between each of the main
surfaces and each of the longer side surfaces, and a corner cutting
edge that connects between the shorter cutting edge and the longer
cutting edge, and the shorter cutting edge has a curved shape that
is outwardly convex, when the same is viewed from a direction of
the main surfaces.
Inventors: |
LEE; Sang Yong;
(Cheongju-si, Chungcheongbuk-do, KR) ; CHOI; Young
Nam; (Cheongju-si, Chungcheongbuk-do, KR) ; MUN; Jae
Yeong; (Cheongju-si, Chungcheongbuk-do, KR) ; AHN;
Sun Yong; (Cheongju-si, Chungcheongbuk-do, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KORLOY INC. |
Seoul |
|
KR |
|
|
Assignee: |
KORLOY INC.
Seoul
KR
|
Family ID: |
58662123 |
Appl. No.: |
15/773165 |
Filed: |
August 30, 2016 |
PCT Filed: |
August 30, 2016 |
PCT NO: |
PCT/KR2016/009616 |
371 Date: |
May 2, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B23C 2200/367 20130101;
B23C 5/207 20130101; B23C 2200/0455 20130101; B23B 27/16 20130101;
B23C 5/20 20130101; B23C 2200/203 20130101; B23C 2200/0494
20130101 |
International
Class: |
B23C 5/20 20060101
B23C005/20 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 4, 2015 |
KR |
10-2015-0154505 |
Claims
1. A double-sided cutting insert having a high feed rate,
comprising: two main surfaces that face in opposite directions; two
shorter side surfaces which connect between the two main surfaces
and which face in opposite directions; two longer side surfaces,
which connect between the two main surfaces and between the two
shorter side surfaces, which face in opposite directions, and the
width of which is larger than that of the shorter side surfaces;
and a fastening hole that extends through the two longer side
surfaces such that a cutting tool fastening bolt is inserted
therein, wherein the double-sided cutting insert having a high feed
rate comprises: a shorter cutting edge provided on a boundary
portion between each of the main surfaces and each of the shorter
side surfaces, a longer cutting edge provided on a boundary portion
between each of the main surface and each of the longer side
surfaces, and a corner cutting edge that connects between the
shorter cutting edge and the longer cutting edge, and wherein the
shorter cutting edge comprises a curved shape that is outwardly
convex, when viewed from the direction of the main surface.
2. The double-sided cutting insert of claim 1, wherein the shorter
cutting edge has a curved shape that is outwardly convex, when
viewed from a direction of the shorter side surface.
3. The double-sided cutting insert of claim 1, the longer cutting
edge comprises, when viewed from a direction of the longer side
surface, first and second concave sections that are inwardly
concaved, and a straight line section that connects the first and
second concave sections.
4. The double-sided cutting insert of claim 3, wherein each of the
first and second concave sections starts from the corner cutting
edge and ends at the straight line section, when viewed from the
direction of the longer side surface.
5. The double-sided cutting insert of claim 4, wherein, when viewed
from the direction of the longer side surface, the corner cutting
edge is connected to the shorter cutting edge in a concave shape,
continuously from the first and second concave sections.
6. The double-sided cutting insert of claim 5, wherein the corner
cutting edge is curved with the same radius of curvature as the
first and second concave sections.
7. The double-sided cutting insert of claim 4, wherein the longer
cutting edge has a symmetrical shape with respect to a center of
the straight line section.
8. The double-sided cutting insert of claim 4, wherein the straight
line section protrudes outwardly relative to the first and second
concave sections.
9. The double-sided cutting insert of claim 1, wherein the shorter
side surface comprises: first and second edge clearance surfaces
adjacent to each of the major surfaces; and a center clearance
surface that connects the first and second edge clearance surfaces,
wherein each of the first and second edge clearance surfaces forms
an obtuse angle with respect to the main surface.
10. The double-sided cutting insert of claim 9, wherein the center
clearance surface forms the right angles with respect to the main
surface and comprises a generally planar shape.
11. The double-sided cutting insert of claim 10, each of the first
and second edge clearance surfaces comprises a shape gradually
increasing in width from a center toward each of the longer side
surface.
12. The double-sided cutting insert of claim 1, wherein each of the
main surfaces is horizontally symmetrical, vertically symmetrical,
and rotationally symmetrical by 180 degrees with respect to the
center thereof, wherein each of the shorter side surfaces is
horizontally symmetrical, vertically symmetrical, and rotationally
symmetrical by 180 degrees with respect to the center thereof, and
wherein each of the longer side surfaces is horizontally
symmetrical, vertically symmetrical, and rotationally symmetrical
by 180 degrees with respect to the center thereof.
13. The double-sided cutting insert of claim 1, wherein, when
viewed from a direction of the main surface, a center of the
shorter cutting edge protrudes more than the other portion.
14. The double-sided cutting insert of claim 2, wherein, when
viewed from a direction of the shorter side surface, a center of
the shorter cutting edge protrudes more than the other portion.
15. A cutting tool equipped with the double-sided cutting insert of
claim 1, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
16. A cutting tool equipped with the double-sided cutting insert of
claim 2, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
17. A cutting tool equipped with the double-sided cutting insert of
claim 3, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
18. A cutting tool equipped with the double-sided cutting insert of
claim 9, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
19. A cutting tool equipped with the double-sided cutting insert of
claim 12, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
20. A cutting tool equipped with the double-sided cutting insert of
claim 13, the cutting tool comprising: a first sheet surface on
which the main surface is placed; a second sheet surface on which
the shorter side surface is placed; and a third sheet surface on
which the longer side surface is placed, wherein the third sheet
surface is inclined in a direction away from the center of the
cutting tool toward a bottom surface of the cutting tool.
Description
BACKGROUND
Technical Field
[0001] The present disclosure relates to a double-sided cutting
insert having a high feed rate and a cutting tool equipped
therewith.
Background Art
[0002] Generally, a cutting insert is fastened to a cutting tool
mounted on a machine tool and is used for cutting a workpiece made
of iron, non-ferrous metal, non-metal material, and so on.
[0003] FIG. 7 is a perspective view of a conventional tangential
cutting insert, and FIG. 8 is a perspective view of another
conventional double-sided cutting insert.
[0004] An example of the conventional tangential cutting insert 10
is disclosed in EP02214857 A1, which includes, as shown in FIG. 7,
an upper surface 12, a lower surface 14, two side surfaces 24 that
connect between the upper surface and the lower surface, a front
surface 20 that connects between the two side surfaces, a main
cutting edge 32 formed between the front surface 20 and the upper
surface 12, a sub cutting edge 34 formed between the front surface
20 and the side surface 24, a fastening hole 18 into which a
cutting tool fastening bolt (not shown) extending through the upper
surface 12 and the lower surface 14 is inserted. In this example,
when viewed from the direction of the upper surface 12, the main
cutting edge 32 has a substantially "V" shape in which two inclined
straight lines are connected in the middle, and when viewed from
the direction of the side surface 24, the sub cutting edge 34 has a
straight line shape. A corner cutting edge 36 is placed between the
main cutting edge 32 and the sub cutting edge 34.
[0005] Another example of the conventional double-sided cutting
insert 10 is disclosed in EP01711296 A1, which includes, as shown
in FIG. 8, two shorter side surfaces 12 that face each other in
opposite directions, two main side surfaces 18 and two sub side
surfaces 16 that connect between the two end surfaces, four main
cutting edges 34 that connects each of the end surfaces 12 and each
of the main side surfaces 18, four sub cutting edge 36 that
connects each of the end surfaces 12 and each of the sub side
surfaces 16, a fastening hole 22 into which a cutting tool
fastening bolt (not shown) extending through the two main side
surfaces is inserted. In this example, the main cutting edge 34 has
a shape of a straight line inclined to one side when viewed from
the direction of the main side surface 18, and the sub cutting edge
36 has a shape of a straight line inclined to one side when viewed
from the direction of the sub side surface 16, and a corner cutting
edge 40 is placed between the main cutting edge 34 and the sub
cutting edge 36.
[0006] However, the conventional technologies like those described
above have a drawback that since the main cutting edge and the sub
cutting edge have a straight line shape, the edge strength is
decreased, and they cannot be used for high feed rate cutting due
to considerable contact load with the workpiece.
DETAILED DESCRIPTION
Technical Problem
[0007] The technical objective of the present disclosure is to
provide a double-sided cutting insert having a high feed rate and a
cutting tool equipped with the same, capable of increasing the edge
strength and also reducing the cutting load such that the same is
suitable for high feed rate cutting.
Technical Solution
[0008] According to an aspect of the present disclosure, there is
provided a double-sided cutting insert having a high feed rate,
which may include: two main surfaces that face in opposite
directions, two shorter side surfaces which connect between the two
main surfaces and which face in opposite directions, two longer
side surfaces, which connect between the two main surfaces and
between the two shorter side surfaces, which face in opposite
directions, and the width of which is larger than that of the
shorter side surfaces, and a fastening hole that extends through
the two longer side surfaces such that a cutting tool fastening
bolt is inserted therein, wherein the double-sided cutting insert
having a high feed rate may include a shorter cutting edge provided
on a boundary portion between each of the main surfaces and each of
the shorter side surfaces, a longer cutting edge provided on a
boundary portion between each of the main surface and each of the
longer side surfaces, and a corner cutting edge that connects
between the shorter cutting edge and the longer cutting edge, and
the shorter cutting edge has a curved shape that is outwardly
convex, when the same is viewed from a direction of the main
surfaces.
[0009] The shorter cutting edge may have a curved shape that is
outwardly convex, when viewed from the direction of the shorter
side surface.
[0010] The longer cutting edge may include first and second concave
sections that are inwardly recessed when viewed from the direction
of the longer side surface, and a straight line section that
connects the first and second concave sections.
[0011] When viewed from the direction of the longer side surface,
each of the first and second concave sections may start from the
corner cutting edge and end in the straight line section.
[0012] When viewed from the direction of the longer side surface,
the corner cutting edge may be connected to the shorter cutting
edge in a concave shape, continuously from the first and second
concave sections.
[0013] The corner cutting edge may be curved with the same radius
of curvature as the first and second concave sections.
[0014] The longer cutting edge may have a symmetrical shape with
respect to a center of the straight line section.
[0015] The straight line section may protrude outwardly relative to
the first and second concave sections.
[0016] The shorter side surface may include first and second edge
clearance surfaces adjacent to each of the major surfaces, and a
center clearance surface that connects the first and second edge
clearance surfaces. Each of the first and second edge clearance
surfaces may form the obtuse angle with respect to the major
surface.
[0017] The center clearance surface may form the right angles with
respect to the main surface and may have a generally planar
shape.
[0018] Each of the first and second edge clearance surfaces may
have a shape gradually increasing in width from the center toward
each of the longer side surfaces.
[0019] Each of the main surfaces may be horizontally symmetrical,
vertically symmetrical, and rotationally symmetrical by 180 degrees
with respect to the center thereof, each of the shorter side
surfaces may be horizontally symmetrical, vertically symmetrical,
and rotationally symmetrical by 180 degrees with respect to the
center thereof, and each of the longer side surfaces may be
horizontally symmetrical, vertically symmetrical, and rotationally
symmetrical by 180 degrees with respect to the center thereof.
[0020] When viewed from the direction of the main surface, the
center of the shorter cutting edge may protrude more than the other
portion.
[0021] When viewed from the direction of the shorter side surface,
the center of the shorter cutting edge may protrude more than the
other portion.
[0022] Meanwhile, a cutting tool according to an embodiment of the
present disclosure is a type of cutting tool that is equipped with
a double-sided cutting insert having a high feed rate according to
the embodiment of the present disclosure described above, which may
include a first sheet surface on which the main surface is placed,
a second sheet surface on which the shorter side surface is placed,
a third sheet surface on which the longer side surface is placed,
and the third sheet surface may be inclined in a direction away
from the center of the cutting tool toward the bottom surface of
the cutting tool.
Advantageous Effects
[0023] As described above, the double-sided cutting insert having a
high feed rate and the cutting tool equipped with the same
according to an embodiment of the present disclosure have the
following effects.
[0024] According to an embodiment of the present disclosure, a
technical configuration is provided, which includes a shorter
cutting edge, a longer cutting edge, and a corner cutting edge, in
which the shorter cutting edge has a curved shape that is outwardly
convex, when viewed from the direction of the main surface. Since
this curved shape can increase the edge strength of the shorter
cutting edge and reduce the contact resistance with the workpiece
and accordingly reduce the contact load, the technical
configuration can be optimized for high feed rate cutting.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] The above and other objects, features and advantages of the
present disclosure will become more apparent to those of ordinary
skill in the art by describing in detail exemplary embodiments
thereof with reference to the accompanying drawings, in which:
[0026] FIG. 1 is a perspective view schematically showing a
double-sided cutting insert having a high feed rate according to an
embodiment of the present disclosure;
[0027] FIG. 2 is a view of the double-sided cutting insert having a
high feed rate of FIG. 1 viewed from the direction of the main
surface;
[0028] FIG. 3 is a view of the double-sided cutting insert having a
high feed rate of FIG. 1 viewed from the direction of the shorter
side surface;
[0029] FIG. 4 is a view of the double-sided cutting insert having a
high feed rate of FIG. 1 viewed from the direction of the longer
side surface;
[0030] FIG. 5 is a view of the double-sided cutting insert having a
high feed rate of FIG. 3 cut along the V-V line;
[0031] FIG. 6 is a perspective view schematically showing a cutting
tool equipped with the double-sided cutting insert having a high
feed rate of FIG. 1;
[0032] FIG. 7 is a perspective view showing a conventional
tangential cutting insert; and
[0033] FIG. 8 is a perspective view showing another conventional
double-sided cutting insert.
BEST MODE
[0034] Hereinafter, preferred embodiments of the present disclosure
will be described in detail with reference to the accompanying
drawings, that will be readily apparent to those skilled in the art
to which the present disclosure pertains. However, the description
proposed herein is just a preferable example for the purpose of
illustrations only, not intended to limit the scope of the
disclosure, so it should be understood that other equivalents and
modifications could be made thereto without departing from the
scope of the disclosure.
[0035] FIG. 1 is a perspective view schematically showing a
double-sided cutting insert having a high feed rate according to an
embodiment of the present disclosure, and FIG. 2 is a view of the
double-sided cutting insert having a high feed rate of FIG. 1
viewed from the direction of the main surface.
[0036] FIG. 3 is a view of the double-sided cutting insert having a
high feed rate of FIG. 1 viewed from the direction of the shorter
side surface, FIG. 4 is a view of the double-sided cutting insert
having a high feed rate of FIG. 1 viewed from the direction of the
longer side surface, and FIG. 5 is a view of the double-sided
cutting insert having a high feed rate of FIG. 3 cut along the V-V
line.
[0037] As shown in FIGS. 1 to 5, a double-sided cutting insert 100
having a high feed rate according to an embodiment of the present
disclosure includes two main surfaces (upper and lower surfaces)
110, two shorter side surfaces 120, two longer side surfaces (sub
side surfaces) 130, a fastening hole 140, a shorter cutting edge
(main cutting edge) 150, a longer cutting edge (outer main cutting
edge) 160, and a corner cutting edge 170. Hereinafter, each of the
components will be described in detail with continued reference to
FIGS. 1 to 5.
[0038] As shown in FIGS. 1 to 4, the two major surfaces 110 face in
opposite directions, the two shorter side surfaces 120 connect
between the two major surfaces 110 and face in opposite directions,
and the two longer side surfaces 130 connect between the two major
surfaces 110 and between the two shorter side surfaces 120, face in
opposite directions, and have a width greater than the shorter side
surface 120. In addition, as shown in FIGS. 1 and 4, the fastening
hole 140 extends through the two longer side surfaces 130 such that
the cutting tool fastening bolt 10 (see FIG. 6) is inserted
therein.
[0039] Further, each of the main surfaces 110 may be horizontally
symmetrical, vertically symmetrical, and rotationally symmetrical
by 180 degrees with respect to the center A2 thereof, as shown in
FIG. 2. Further, each of the shorter side surfaces 120 may be
horizontally symmetrical, vertically symmetrical, and rotationally
symmetrical by 180 degrees with respect to the center A3 thereof,
as shown in FIG. 3. Each of the longer side surfaces 130 may also
be horizontally symmetrical, vertically symmetrical, and
rotationally symmetrical by 180 degrees with respect to the center
A4 thereof, as shown in FIG. 4. Therefore, the cutting insert may
be applied not only to a right-handed type cutting tool 200 (see
FIG. 6) that performs cutting while being rotated to the right, but
also to a left-handed type cutting tool (not shown) that performs
cutting while being rotated to the left, and with the double-sided
cutting insert 100 having a high feed rate according to the present
disclosure, it is possible to use any type of cutting tool using
eight corners alternately.
[0040] As shown in FIGS. 1 to 4, a shorter cutting edge (main
cutting edge) 150 is provided on a boundary portion between each of
the main surfaces 110 and each of the shorter side surfaces 120 to
substantially cut the workpiece in contact therewith, the longer
cutting edge 160 is provided on a boundary portion between each of
the main surfaces 110 and each of the longer side surfaces 130 to
substantially cut the workpiece in contact therewith, and the
corner cutting edge 170 connects between each of the shorter
cutting edges 150 and each of the longer cutting edges 160 to
substantially cut the workpiece in contact therewith. The
double-sided cutting insert 100 having a high feed rate according
to an embodiment of the present disclosure described above includes
four shorter cutting edges 150, four longer cutting edges 160, and
eight corner cutting edges 170.
[0041] Hereinafter, referring to FIGS. 1 to 4 again, the shorter
cutting edge 150 will be described in more detail.
[0042] The shorter cutting edge 150 has a curved shape that is
outwardly convex, when viewed from the direction of the main
surface 110, as shown in FIG. 2. Therefore, a convex curved shape
can allow increased edge strength of the shorter cutting edge 150,
while it also reduces the contact resistance with the workpiece and
thus reduces the cutting load, and accordingly, the double-sided
cutting insert 100 having a high feed rate according to the present
disclosure, which has the shorter cutting edge in the shape
described above, can be ultimately used for high feed rate cutting.
In addition, as shown in FIG. 2, when viewed from the direction of
the main surface 110, the center of the shorter cutting edge 150
may protrude more than the other portion, and has a horizontally
symmetrical structure about the protruding portion such that the
cutting insert can be used for both the left-handed type cutting
tool (not shown) and the right-handed type cutting tool 200 (see
FIG. 6).
[0043] In addition, the shorter cutting edge 150 may have curved
shape that is outwardly convex, even when viewed from the direction
of the shorter side surface 120, as shown in FIG. 3. Thus, the
shorter cutting edges 150 form an obtuse angle with respect to the
longer cutting edge 160 when viewed from the direction of the main
surface 110 as shown in FIG. 2, and form an obtuse angle with
respect to the longer side surface 130 when viewed from the
direction of the shorter side surface 120 as shown in FIG. 3, such
that the shorter cutting edge 150 have a substantially helix
cutting edge structure, and this can further increase the edge
strength of the shorter cutting edge 150 and further reduce the
cutting load of the shorter cutting edge 150.
[0044] Further, as shown in FIG. 3, even when viewed from the
direction of the shorter side surface 120, the center of the
shorter cutting edge 150 may protrude more than the other portion,
and the shorter cutting edge 150 may have a horizontally
symmetrical structure about the protruding portion such that the
cutting insert can be used for both left-handed type cutting tool
(not shown) and right-handed type cutting tool 200 (see FIG.
6).
[0045] Hereinafter, referring to FIGS. 1 to 4 again, the longer
cutting edge 160 will be described in more detail.
[0046] As shown in FIGS. 1 and 4, the longer cutting edge 160 may
include a first concave section (a first outer main cutting edge)
161 and a second concave section (a third outer main cutting edge)
162, which are inwardly concaved when viewed from the direction of
the longer side surface 130, and a straight section (a second outer
main cutting edge) 163 that connects between the first and second
concave sections 161 and 162. Thus, the edge strength of the longer
cutting edge 160 can be enhanced through the first and second
concave sections 161 and 162, and the cutting load of the longer
cutting edge 160 can be reduced through the first and second
concave sections 161 and 162, which results in reduces the cutting
resistance with the workpiece during a pocket cutting for
processing grooves and so on. Further, although not shown, when the
cutting insert 100 according to the present disclosure is mounted
on a cutting tool (see 200 in FIG. 6), since the cutting insert 100
according to the present disclosure may be realized in a positively
inclined form with respect to the axis (see C1 in FIG. 6) of the
cutting tool (see 200 in FIG. 6) through the first or second
concave section 161 or 162, it is possible to prevent the
interferences with the side wall of the workpiece during the step
cutting and also reduce the cutting resistance when the cutting
insert contacts with the workpiece.
[0047] Further, as shown in FIGS. 1 and 4, each of the first and
second concave sections 161 and 162 may start from the corner
cutting edge 170 and end in the straight line section 163, when
viewed from the direction of the longer side surface 130. In
addition, as shown in FIG. 4, the longer cutting edge 160 may have
a vertically symmetrical shape with respect to the center of the
straight line section such that the cutting insert can be used for
both left-handed type cutting tool (not shown) and right-handed
type cutting tool 200 (see FIG. 6).
[0048] In addition, the straight section 163 may relatively
outwardly protrude with respect to the first and second concave
sections 161 and 162, as shown in FIGS. 1 and 4. Accordingly, since
the longer side surface 130 becomes wider as much as the protruded
straight line section 163, when the cutting insert is fastened with
the cutting tool 200 (see FIG. 6), the contact area with the third
sheet surface 203 (see FIG. 6) of the cutting tool 200 (see FIG. 6)
is increased, thus enhancing the fastening stability with respect
to the cutting tool 200 (see FIG. 6). In particular, as shown in
FIGS. 1 and 4, the straight section 163 of the cutting insert 100
according to the present disclosure outwardly protrudes relative to
the first and second concave sections 161 and 162 so that the
contact area is increased as much as the protruded section, thus
resulting in enhanced fastening stability with respect to the
cutting tool (200 in FIG. 6). However, according to the
conventional technology, as shown in FIG. 7, the main cutting edge
32 of the cutting insert 10 is concaved in an approximately "V"
shape when viewed from the direction of the upper surface 12 such
that the contact area is reduced as much as the amount of the
concaved depth and therefore, the fastening stability with respect
to the cutting tool is deteriorated in comparison with the present
disclosure.
[0049] Hereinafter, referring to FIGS. 1 to 4 again, the corner
cutting edge 170 will be described in more detail.
[0050] As shown in FIGS. 1 and 4, when viewed from the direction of
the long portion side surface 130, the corner cutting edge 170 may
be connected to the shorter cutting edge 150 in a concave shape,
continuously from the concave sections 161 and 162 of the longer
cutting edge 160. Thus, the edge strength of the corner cutting
edge 170 can be enhanced through the corner cutting edge 170 in the
concave shape, and the cutting load of the corner cutting edge 170
can be reduced through the corner cutting edge 170 of the concave
shape, which results in reduced cutting resistance with respect to
the workpiece during pocket cutting for cutting grooves and so
on.
[0051] Particularly, as shown in FIG. 4, the corner cutting edge
170 may be curved with the same radius of curvature as the concave
sections 161 and 162 of the longer cutting edge 160 described
above. Therefore, dimension management for the corner cutting edge
170 can be facilitated.
[0052] Hereinafter, referring to FIGS. 1, 3 and 5 again, the
shorter side surface 120 will be described in more detail.
[0053] As shown in FIGS. 1, 3 and 5, the shorter side surface (main
side surface) 120 may include first and second edge clearance
surfaces 121 and 122 (primary clearance surface) adjacent to the
respective major surfaces 110, and a center clearance surface
(secondary clearance surface) 123 that connects the first and
second edge clearance surfaces 121 and 122. In addition, as shown
in FIG. 5, each of the first and second edge clearance surfaces 121
and 122 may form an obtuse angle .theta.1 with respect to the main
surface 110. Thus, since the first and second edge clearance
surfaces 121 and 122 adjacent to the shorter cutting edge 150 form
an obtuse angle .theta.1 with respect to the main surface 110, an
amount of the body of the shorter cutting edge 150 is increased,
thereby increasing the strength of the shorter cutting edge
150.
[0054] Further, the center clearance surface 123 may form the right
angles with respect to the main surface 110 and have a generally
planar shape. Accordingly, when the cutting insert is fastened to
the cutting tool 200 (see FIG. 6), the contact area with the third
sheet surface 203 (see FIG. 6) of the cutting tool 200 (see FIG. 6)
is increased, thereby enhancing the fastening stability with
respect to the cutting tool 200 (see FIG. 6).
[0055] In addition, each of the first and second edge clearance
surfaces 121 and 122 may have a shape that gradually increases in
width from the center thereof toward each of the longer side
surface 130, as shown in FIG. 3.
[0056] Hereinafter, a cutting tool 200 according to an embodiment
of the present disclosure will be described in detail with
reference to FIG. 6.
[0057] FIG. 6 is a perspective view schematically showing a cutting
tool equipped with the double-sided cutting insert having a high
feed rate of FIG. 1.
[0058] The cutting tool 200 according to an embodiment of the
present disclosure is a type of cutting tool that is equipped with
a double-sided cutting insert 100 having a high feed rate according
to an embodiment of the present disclosure described above, and it
includes a first sheet surface 201, a second sheet surface 202, and
a third sheet surface 203, which are provided in the pocket
portion.
[0059] The first sheet surface 201 is where the main surface 110 of
the double-sided cutting insert 100 having a high feed rate
according to the present disclosure described above is placed, the
second sheet surface 202 is where the shorter side surface 120 of
the double-sided cutting insert 100 having a high feed rate
according to the present disclosure described above is placed, and
the third sheet surface 203 is where the longer side surface 130 of
the double-sided cutting insert 100 having a high feed rate
according to the present disclosure described above is placed.
[0060] In particular, the third sheet surface 203 may be inclined
at a second angle .theta.2 in a direction away from the center C1
of the cutting tool 200 toward the bottom surface 204 of the
cutting tool 200. Therefore, when a double-sided cutting insert 100
having a high feed rate according to an embodiment of the present
disclosure is mounted on the third sheet surface of the cutting
tool of the present disclosure, a back taper is formed as much as
the second angle .theta.2, thereby reducing the interference with
the workpiece during the pocket cutting.
[0061] The present disclosure has been described in detail,
however, it should be understood that the detailed description and
specific examples, while indicating preferred embodiments of the
disclosure, are given by way of illustration only, since various
changes and modifications within the scope of the disclosure will
become apparent to those skilled in the art from this detailed
description.
INDUSTRIAL APPLICABILITY
[0062] The present disclosure relates to a double-sided cutting
insert having a high feed rate and a cutting tool that is equipped
with the same, which can be applied to cutting a workpiece and thus
is industrially applicable.
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